http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54791
--- Comment #2 from David Edelsohn <dje at gcc dot gnu.org> 2012-10-03 13:46:44 UTC --- Constructors are working because they work without your big header. I would try using divide and conquer techniques to reduce the big header and find out what is interfering with constructors. It gives all appearances that it is due to the user code. Static constructors and destructors are run by functions generated at link time. A programmer wrapper around AIX ld called "collect2" scans object files and libraries for constructors and generates functions that are invoked by AIX linker -binitfini feature. You can add -Wl,-debug to the link line to see the way the AIX linker is invoked and see the helper function. Is something in the big header changing the mangled names of constructors and destructors so that they do not use the standard pattern? Or inserting some illegal character like dollar sign ($)?